GLX Street Bike Motorcycle Full Face Helmet Dual Visor DOT Approved [DOT Approved] meets or excess FMVSS No. 218 safety standard Dual Visor, Fiber Reinforced, Lightweight Polycarbonate/ABS Shell, EPS Absorption Impact Foam Quick release strap for easy use; liner/cheek pads are removable and washable Three-level Air-Flow ventilation system; channeled vents with flow-through technology make safe riding comfortable year round Adult Motorcycle Helmet: Size M (57-58 CM,22.5/22.9 Inch); Size L (59-60 CM,23.3/23.6 Inch); Size XL (61-62 CM,24/24.4 Inch)